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Researchers developed a novel supercavity mode for efficient nanolasers. This approach merges bound states in the continuum, significantly reducing lasing thresholds and improving quality factors in small-footprint devices.

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Area of Science:

  • Photonics and Nanotechnology
  • Laser Physics

Background:

  • Wavelength-scale lasers require high-quality optical cavities for low power consumption.
  • Optical bound states in the continuum (BICs) suppress radiative losses but are limited by finite resonator size in nanophotonic devices.

Purpose of the Study:

  • To realize an efficient laser using a finite-size cavity with a small footprint.
  • To overcome the limitations of BICs in active nanophotonic devices by employing a supercavity mode.

Main Methods:

  • Concept of a supercavity mode created by merging symmetry-protected and accidental BICs in momentum space.
  • Fabrication of a finite-size laser cavity.
  • Tuning lattice spacing to observe lasing property evolution.

Main Results:

  • Demonstration of a significantly reduced lasing threshold.
  • Substantially increased quality factor (Q-factor) of the cavity.
  • Shrunken far-field images indicating improved beam characteristics.

Conclusions:

  • The supercavity mode approach provides a viable route for developing high-performance nanolasers.
  • Reduced out-of-plane losses and improved lasing characteristics are achieved in finite-size active nanodevices.